Datasheet

Figure 24-5. TX DMA Default Operation Using Normal Descriptors
Start Tx DMA
(Re-)fetch next
descriptor
Write status word
to TDES0
Wait for Tx status
Transfer data from
buffer(s)
Frame xfer
complete?
Timestamp
present?
Write timestamp to
TDES2 and TDES3
Stop Tx DMA
Tx DMA suspended
No
Yes
No
Yes
No
No
Start
Yes
Yes
Yes
Close intermediate
descriptor
No
Yes
No
Yes
No
Poll demand
A
A
Start = 0
Error
Condition?
OWN bit
set?
Error
Condition?
Error
Condition?
Error
Condition?
If using Enhanced Descriptors, TDES2 and TDES3 are replaced with TDES6 and TDES7.
1597December 13, 2013
Texas Instruments-Advance Information
Tiva
™
TM4C129XNCZAD Microcontroller